Morph your sister's body into something more desirable

As desirable as your sister's body was, you'd feel more comfortable in a male body. Besides you could morph into any girl you wanted, so best to erase all traces of your sister now. So you went to the bathroom, pulled off your clothes and after admiring your sexy naked form focused on changing. Your hair shortened to the much more modest length you kept it and darkened to a dirty blond. Your skin remained tanned as your breasts flattened away and turned into pecs while your stomach showed nicely formed abs and the rest of your muscles grew as your grew taller and more masculine, and finally male privates appeared between your legs. You now looked like a seventeen year old version of your old body, well with maybe a little extra muscle, but that was it.

And there of course now turned into a faded birthmark were the two amulets, right in the middle of your toned chest. They were hardly visible though and wouldn't be noticed. You raised a hand and summoned a ball of crackling golden flames, while in the other hand you summoned flames that were red and black. From your back you sprouted a pair of black bat-like wings and a pair of white feathered eagle-like wings. "I control the powers of good and evil, light and dark. I can do anything, " you say, looking over your now angelic form.